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Its only an issue if you have a winch truck, the aux input can be reprogrammed on any other truck for exbrake kickdown/pre-select.

I suspect it would, but you would have to get the truck to shift down to that gear first, same as using the down arrow. And like the down arrow, I suspect it would be overridden by high RPM for safety… you can read about it in the appendices of the MD3060 troubleshooting manual… and of course...

Don’t know. Maybe never:), Not a lot of info available on it. But more likely it would override the hold as it approaches idle or some other preset low or high RPM. Like when you select a lower gear with the arrow, if the engine reaches peak RPM, it overrides your selection and upshifts to...

I would be curious what RPM it kicks down from 7-6. unless the TPS indicates to the transmission that you are maintaining speed it would likley downshift somewhere around the peak torque point 1500-1600RPM? The procedure is a little buried, but you do 5 power on-power off cycles in...

Hey when you ran the TCM thru the routine to relearn 0-100% TPS and relearn the shift points, did you first confirm the pedal rotates the governor linkage between the idle and full RPM stops? AND fully warm up the engine and trans before you began?

Yours is a WTEC2, i have seen some screenshots of the trans controller programming, and it appears that auxiliary hold was possibly enabled on non winch trucks as a default auxiliary input function(Wire 153 to signal ground 161B). When enabled this overrides the normal shift parameters and...

It would be nice to be able to reprogram the shift points, or manually upshift on the Allison. Awesomeness, have you ever checked/calibrated your TPS?

Yes the 3.07 swap lowers the engine, trans and driveshaft RPM for a given highway speed.

Whale...

Yea air drag is a big factor, you double the air velocity, you quadruple the drag… for practical purposes, you are going to have to do some pretty extensive modifications to make these rough contoured bricks any more aerodynamic… The kicker for an over lander is the need for protective...

Yep, HEUI oil pressure can indicate how hard you are working it…

I think when you are dealing with this much weight, rolling drag and wind resistance, finding MPG sweet spots is not easy. I think you have probably done the best thing in that regard by re-gearing. Getting the sustained load closer to the peak torque RPM is probably the best thing you can do...